I hate non-compete agreements as much as anyone else, but since when is it supposed to be in the president's power to ban anything? This should be done as a law or not at all. Legislating from the executive branch undermines the very structure of our government and is intolerable.
It is within the executive branches power to ban something when the legislative branch has granted it such power by law which is exactly what the judge ruled has happened in this case.
The title doesn't make this clear but this was a decision made by the FTC not by an executive order. There's still an argument that can be made about the extent to which the executive branch vs. legislative branch should be deciding these kind of things which would be fair but it's not Biden personally mandating this change.